Added a type annotation

[advent-of-code-17.git] / src / advent19 / advent19.hs

diff --git a/src/advent19/advent19.hs b/src/advent19/advent19.hs
index 98f6d21ea53077e21debd4a046d559b36d0ef3de..06a706715664533fb70dd484771afd481e531fda 100644 (file)
--- a/src/advent19/advent19.hs
+++ b/src/advent19/advent19.hs
@@ -44,6 +44,7 @@ delta Down  = ( 1,  0)
 delta Left  = ( 0, -1)
 delta Right = ( 0,  1)
 
+isJunction :: Char -> Bool
 isJunction '+' = True
 isJunction  _  = False